"10"-mint condition (as it left the factory), "9"-near mint (most collectors would be quite satisfied with a model which has this grading). A "9" might have some rather minor chrome rubs, re-plated original chrome, or possibly a tiny paint imperfection. Nothing broken or missing (any photos taken with missing parts, the missing parts will be replaced before we ship). Older models made of acetate plastic likely will have a normal or less than normal amount of warp. Please note that we don't grade all that many models as a "10", so a "9" is a very good grading. "8"-could have any of the following: a subtle vent post crack, more substantially worn chrome (more so than a "9"),a slightly larger paint flaw, or some moderate warp (in the case of older acetate models. "7"-Likely to have somewhat more noticeable flaw(s) than any of the above gradings, but still a decent looking model. "6"-Likely to have scratch(es), crack(s), or missing/broken part(s). "5"-very average, not a top shelf model, obvious flaw(s). "0"-"4"-Poor to fair-very likely, we won't be listing many models with a grading this low, but if we do, please don't expect a lot.